Re: Solve fails with this simple inequality problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg115748] Re: Solve fails with this simple inequality problem*From*: Bob Hanlon <hanlonr at cox.net>*Date*: Thu, 20 Jan 2011 06:26:14 -0500 (EST)

Reduce[Meter == Floor[a*Sqrt[19] + 7] && Meter < 6 && (a == -1 || a == 1), {a, Meter}] a == -1 && Meter == 2 Bob Hanlon ---- michael partensky <partensky at gmail.com> wrote: ============= Ken, Sqrt returns by definition the *positive* root. Your question would have been legit (with its syntax properly fixed) for the negative root, but this must be handled by adding minus (-Sqrt[19]) explicitly. Can anyone help to reformulate the problem to handle both signs elegantly? Thanks Michael Partenskii On Sun, Jan 16, 2011 at 5:55 AM, KenR <ramsey2879 at msn.com> wrote: > Solve[Meter = Floor[Sqrt[19]+7] && Meter < 6, Meter] gives a null "{}" > Any workarounds? > > -- Bob Hanlon